1-2+3-4+5-6+7-8+···+2013-2014 要过程,谢谢

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/05 15:28:36
1-2+3-4+5-6+7-8+···+2013-2014 要过程,谢谢
xN@_Kv鑃I] DB@Q%JD ,-gٖ+^Y0zOv3OtjZ$IS$M3{*14ݤhSWU3^\㕚D!P9z-E8 ~, Y!zt7A5WFȤiQ"CӒRҤQs,hRq>_kD{X9V4*<9 Dڈ޺N;Y]rG>Wc1q,je YɵKEU+L77D 2QWwPyn+wR}%z7$l"r2

1-2+3-4+5-6+7-8+···+2013-2014 要过程,谢谢
1-2+3-4+5-6+7-8+···+2013-2014 要过程,谢谢

1-2+3-4+5-6+7-8+···+2013-2014 要过程,谢谢
总共2014个数字,我们从左往右四位一看:(1-2-3+4)+(5-6-7+8)+...+(2005-2006-2007+2008)+(2009-2010-2011+2012)+2013-2014可以发现每四位一段,其和均为零,即中间两个数之和与旁边两个相抵消,故按顺序取四个为一组,2014/4=503余2,共503组零2个,还剩下(2013-2014)=-1,即为答案.

俗语和名句的填空1······,自知之明.2······,行必果.3工欲善其事,······.4临渊羡鱼,······.5非学无以广才,······.6······,福兮祸之所伏.7项庄舞剑,······.8······,人以群 (2+4+6+8+······+100)—(1+3+5+7+······+99)等于几 (1+3+5++7+9······+2011)-(2+4+6+8······+2012)= 2011红领巾快乐数独答案一2·····4·9·631·4·8·8··97··3··3··2·95···95·86···15·3··7··9··47··5·7·3·182·3·4·····7二7·1·8·3·····413·6·2·6···4·8·8·5·1·2·61·····94·2·9·4·7·8· 观察下列三角形数表其中从第二行起每行的每一个数为其肩膀上两树之和则该表的最后一个数是?1 2 3 4 5 6 7 8················ 97 98 99 100 3 5 7·························· 把1 9填入81格方框,不能重复· · 4 · · 5 · 6 ·9 · · 3 · · · 5 17 · · 6 · · · · 3· · 9 · 1 6 · 4 ·· 2 · 4 · · · 8 ·· 4 · 7 · · 5 · ·5 · · · · 7 · · 84 1 · · · 8 · · 5· 8 · 9 · · 6 · 4 全部属于裸子植物的是 1卷柏 2侧柏 3银杏 4刺槐 5苏铁 6梧桐 7云杉 8贯从 9珙桐 A1237 B2357 C2379 D1358贯从是贯众······························· 1×2+2×3+3×4+4×5+5×6+6×7+7×8+8×9··········+100×101等于多少?1×2+2×3+3×4+4×5+5×6+6×7+7×8+8×9··········+n(n+1)这个要代数式. 带有数字的四字词语按顺序1···2···3···4···5···6···7···8···9···10···祝福语 这几道奥数题谁会,求2014在哪一行那一列 1 2 3 4 5 10 9 8 7 6 11 12 13 14 15 20 19 18 17 16 求2014哪一行那一列 1 2 3 4 5 6 7 8 9 ···· ····· ·························· 带数字1·2·3·4·5·6·7·8·9·10·的成语,每个数字至少三个 1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········? 4/3×6/5×8/7×······×(2n+2)/(2n+1)求积 1+2+3+4+5+6+7+8+9······+99=?1 1+2-3-4+5+6-7-8+9+10······+1990怎么简算急 1-2+3-4+5-6+7-8+9······+99-100 1×2+3×4+5×6+7×8······+199×200= 计算1+(2+3)-(4+5)+(6+7)-(8+9)······-(48+49)+50=